Make: Winchester & Webley

Model: Winchester "Pendulum Gun" Standard Pressure Test Barrels & Apparatus; Webley Patent Pressure Test Gun

Serial Number: 1, 2, 4, 5, 7, 8, 9, and NVSN

Year of Manufacture: 1940s

Gauge: 28g, 20g, 12g, .410, 16g

Action Type: Falling Block, Breech Loaders

Markings: Standard Pressure barrels (No.1,2,4,5,7,8,9) individually marked with gauge, chamber length, choke, date, and Winchester/New Haven address. Webley barrel marked “WEBLEY/PATENT No.6365/1902”, British proofs, and “12 GAGE./6-22-34”.

Barrel Lengths: 28" (#1), 30" (#2), 26" (#4), 28" (#5), 25¾" (#7), 25" (#8), 26" (#9), 30" (NVSN).

Chokes: Full (#1,2,5,7,9,NVSN), Skeet (#4), Cylinder (#8).

Sights/Optics: None.

Type of Finish: Raw White Metal

Finish Originality: Original

Bore Condition: Bores are bright, sharp, and erosion-free. All rate 10/10.

Overall Condition: Both Winchester and Webley apparatus retain about 99% original finish with minimal patina and handling marks. Screw heads sharp; markings clear. Excellent overall.

Mechanics: Actions function correctly. A thorough cleaning may be required to meet your standards.

Box, Paperwork & Accessories: Includes extensive original Winchester and Webley accessories: multiple swages, plates, shims, barrel rests, threaded rods, screws, nuts, bolts, and historical artifacts such as original Winchester Lead Crusher cylinders, copper cylinders, and one pressurized lead cylinder demonstrating pressure-testing methods. Additionally, vintage diagrams, photos (color/B&W), and prints showing equipment setup and use included.

Our Assessment:
Offered here are two rare and significant firearm-testing instruments—a Winchester Pendulum Pressure Testing apparatus with seven original standard pressure barrels, and a Webley Patent Pressure Test Gun (1902 Patent) used for ammunition evaluation. These devices measured internal ballistic performance—pressure, recoil, and velocity—ensuring cartridge safety standards were maintained.

The Winchester apparatus employs standard pressure barrels, each clearly marked with specifications, dates, and Winchester factory markings. Suspended precisely to minimize friction, the Pendulum Gun translates recoil into quantifiable data, accurately measuring pressure through specialized "crusher" cylinders.

The Webley gun, a self-contained unit marked with historic British proofs and patent details, offers additional collector value. Its refined design exemplifies early 20th-century advancements in ammunition testing.

Included is a museum-worthy array of accessories: original lead and copper crusher cylinders, demonstrating the innovative methods Winchester utilized for quality assurance. Comprehensive photographs and diagrams document both guns' historical use, providing collectors, historians, and museums a tangible insight into the meticulous science behind ammunition production.

This historically significant set not only documents Winchester and Webley’s commitment to quality but also serves as a tangible reminder of the rigorous standards underpinning ammunition safety today.